The financial position of a company depends on its liquidity, or otherwise, on how soon the funds invested in the assets turn into real money. The growth of non-payments complicates the company’s rhythmic activities (purchase of raw materials, payment of labor and other expenses generated from revenue) and leads to an increase in accounts receivable. At the same time, excessive diversion of funds to production stocks, work in progress, finished products, etc. leads to the deadening of resources and inefficient use of working capital. Successful solution of the problem of working capital optimization can significantly increase the financial stability of the company, refinance and repay the debt, and significantly facilitate debt restructuring. Therefore, effective management of the company’s working capital is the key to increasing the turnover of property and sales volumes. It involves not only the search for and attraction of additional sources of financing, but also their rational placement in the current assets of the company. The article presents the author’s model of analyzing the profitability of working capital. The article reveals the influence of factors affecting the profitability of working capital and author’s methodical approach to his calculations (method # 2 integral factor analysis, developed by Filatov E.A.). The article presents the author’s analytical, systematic statistical analysis of key performance indicators reveal the influence to change the profitability of working capital of the companies in the Irkutsk region of the Russian Federation.